<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>login</title>
</head>
<body>
    <form action='/addaction/' method="post">
        用户名: <input type="text" name="username" /><br>
        密码: <input type="text" name="password" /><br>
        年龄: <input type="text" name="age" /><br>

        <input type="submit" value="添加用户">
    </form>
</body>
</html>